PJB-2020-107
EFFECT OF DROUGHT ON GRAIN GROWTH IN SIX RICE GENOTYPES AT GRAIN FILLING STAGE S. MOONMOON1*, M.S.A. FAKIR2, M.T. ISLAM3 1Department of Crop Botany and Tea Production Technnology, Sylhet Agricultural University, Bangladesh 2Department of Crop Botan&
Dr. Sharifunnessa Moonmoon
Abstract
ABSTRACT Scarcity of water for irrigation is an alarming issue limiting crop production worldwide, even in Bangladesh. Rice production in Bangladesh is thus, being adversely hampered by the shortage of water.The study was therefore, contemplated to determine the effect of drought stress on grain filling rate under drought imposed at anthesis to maturity of six rice genotypes in two aman seasons under drought (40% field capacity, FC) and control (100% field capacity, FC) irrigations .Twelve treatments (6 genotypes × 2 irrigations) were arranged in CRD and experiment was carried out at Bangladesh Institute of Nuclear Agriculture, Bangladesh. Drought was imposed at grain filling stage where grain filling rate was estimated. Growth was significantly (P>0.05) decreased at 40% FC in both the seasons. Compared to control, relative reduction at 40% FC in above parameter, genotypes were classified into tolerant (Binadhan-13 and NERICA mutant) and sensitive (RM-100-16, Ukunimodhu, Kalizira, and BRRI dhan34) categories. Low reduction percentages of the traits under drought stress to that of the control discriminated Binadhan-13 and NERICA mutant genotypes consistently as drought tolerant. Key words: Oryza sativa L., Drought, Panicle, Anthesis, Grain filling, Bangladesh.
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